#!/bin/sh

test_description='core.whitespace rules and git apply'

. ./test-lib.sh

prepare_test_file () {

        # A line that has character X is touched iff RULE is in effect:
        #       X  RULE
        #       !  trailing-space
        #       @  space-before-tab
        #       #  indent-with-non-tab
        sed -e "s/_/ /g" -e "s/>/       /" <<-\EOF
                An_SP in an ordinary line>and a HT.
                >A HT.
                _>A SP and a HT (@).
                _>_A SP, a HT and a SP (@).
                _______Seven SP.
                ________Eight SP (#).
                _______>Seven SP and a HT (@).
                ________>Eight SP and a HT (@#).
                _______>_Seven SP, a HT and a SP (@).
                ________>_Eight SP, a HT and a SP (@#).
                _______________Fifteen SP (#).
                _______________>Fifteen SP and a HT (@#).
                ________________Sixteen SP (#).
                ________________>Sixteen SP and a HT (@#).
                _____a__Five SP, a non WS, two SP.
                A line with a (!) trailing SP_
                A line with a (!) trailing HT>
        EOF
}

apply_patch () {
        >target &&
        sed -e "s|\([ab]\)/file|\1/target|" <patch |
        git apply "$@"
}

test_fix () {

        # fix should not barf
        apply_patch --whitespace=fix || return 1

        # find touched lines
        diff file target | sed -n -e "s/^> //p" >fixed

        # the changed lines are all expeced to change
        fixed_cnt=$(wc -l <fixed)
        case "$1" in
        '') expect_cnt=$fixed_cnt ;;
        ?*) expect_cnt=$(grep "[$1]" <fixed | wc -l) ;;
        esac
        test $fixed_cnt -eq $expect_cnt || return 1

        # and we are not missing anything
        case "$1" in
        '') expect_cnt=0 ;;
        ?*) expect_cnt=$(grep "[$1]" <file | wc -l) ;;
        esac
        test $fixed_cnt -eq $expect_cnt || return 1

        # Get the patch actually applied
        git diff-files -p target >fixed-patch
        test -s fixed-patch && return 0

        # Make sure it is complaint-free
        >target
        git apply --whitespace=error-all <fixed-patch

}

test_expect_success setup '

        >file &&
        git add file &&
        prepare_test_file >file &&
        git diff-files -p >patch &&
        >target &&
        git add target

'

test_expect_success 'whitespace=nowarn, default rule' '

        apply_patch --whitespace=nowarn &&
        diff file target

'

test_expect_success 'whitespace=warn, default rule' '

        apply_patch --whitespace=warn &&
        diff file target

'

test_expect_success 'whitespace=error-all, default rule' '

        apply_patch --whitespace=error-all && return 1
        test -s target && return 1
        : happy

'

test_expect_success 'whitespace=error-all, no rule' '

        git config core.whitespace -trailing,-space-before,-indent &&
        apply_patch --whitespace=error-all &&
        diff file target

'

test_expect_success 'whitespace=error-all, no rule (attribute)' '

        git config --unset core.whitespace &&
        echo "target -whitespace" >.gitattributes &&
        apply_patch --whitespace=error-all &&
        diff file target

'

for t in - ''
do
        case "$t" in '') tt='!' ;; *) tt= ;; esac
        for s in - ''
        do
                case "$s" in '') ts='@' ;; *) ts= ;; esac
                for i in - ''
                do
                        case "$i" in '') ti='#' ;; *) ti= ;; esac
                        rule=${t}trailing,${s}space,${i}indent

                        rm -f .gitattributes
                        test_expect_success "rule=$rule" '
                                git config core.whitespace "$rule" &&
                                test_fix "$tt$ts$ti"
                        '

                        test_expect_success "rule=$rule (attributes)" '
                                git config --unset core.whitespace &&
                                echo "target whitespace=$rule" >.gitattributes &&
                                test_fix "$tt$ts$ti"
                        '

                done
        done
done

create_patch () {
        sed -e "s/_/ /" <<-\EOF
                diff --git a/target b/target
                index e69de29..8bd6648 100644
                --- a/target
                +++ b/target
                @@ -0,0 +1,3 @@
                +An empty line follows
                +
                +A line with trailing whitespace and no newline_
                \ No newline at end of file
        EOF
}

test_expect_success 'trailing whitespace & no newline at the end of file' '
        >target &&
        create_patch >patch-file &&
        git apply --whitespace=fix patch-file &&
        grep "newline$" target &&
        grep "^$" target
'

test_expect_success 'blank at EOF with --whitespace=fix (1)' '
        : these can fail depending on what we did before
        git config --unset core.whitespace
        rm -f .gitattributes

        { echo a; echo b; echo c; } >one &&
        git add one &&
        { echo a; echo b; echo c; } >expect &&
        { cat expect; echo; } >one &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=fix patch &&
        test_cmp expect one
'

test_expect_success 'blank at EOF with --whitespace=fix (2)' '
        { echo a; echo b; echo c; } >one &&
        git add one &&
        { echo a; echo c; } >expect &&
        { cat expect; echo; echo; } >one &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=fix patch &&
        test_cmp expect one
'

test_expect_success 'blank at EOF with --whitespace=fix (3)' '
        { echo a; echo b; echo; } >one &&
        git add one &&
        { echo a; echo c; echo; } >expect &&
        { cat expect; echo; echo; } >one &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=fix patch &&
        test_cmp expect one
'

test_expect_success 'blank at end of hunk, not at EOF with --whitespace=fix' '
        { echo a; echo b; echo; echo; echo; echo; echo; echo d; } >one &&
        git add one &&
        { echo a; echo c; echo; echo; echo; echo; echo; echo; echo d; } >expect &&
        cp expect one &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=fix patch &&
        test_cmp expect one
'

test_expect_success 'blank at EOF with --whitespace=warn' '
        { echo a; echo b; echo c; } >one &&
        git add one &&
        echo >>one &&
        cat one >expect &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=warn patch 2>error &&
        test_cmp expect one &&
        grep "new blank line at EOF" error
'

test_expect_success 'blank at EOF with --whitespace=error' '
        { echo a; echo b; echo c; } >one &&
        git add one &&
        cat one >expect &&
        echo >>one &&
        git diff -- one >patch &&

        git checkout one &&
        test_must_fail git apply --whitespace=error patch 2>error &&
        test_cmp expect one &&
        grep "new blank line at EOF" error
'

test_expect_success 'blank but not empty at EOF' '
        { echo a; echo b; echo c; } >one &&
        git add one &&
        echo "   " >>one &&
        cat one >expect &&
        git diff -- one >patch &&

        git checkout one &&
        git apply --whitespace=warn patch 2>error &&
        test_cmp expect one &&
        grep "new blank line at EOF" error
'

test_done